Calculate the required sample size when the researcher is interested in calculating with either a mean or a proportion from sample data.
Answer:
Since we are interested in estimating the mean internet usage in the population of interest we select sample size calculation for a Mean. In the screen shot below we entered 1 (minute) as the Acceptable error and 6.95 as the initial estimate of the Sample standard deviation. The Confidence level is 95% so we choose a z-value of 1.96.